refactor: implement packet parsing heuristics and introduce device-level state caching to throttle database writes and vitals updates

2026-07-11 14:24:14 +05:30
parent a4972b3251
commit 84b8acc904
32 changed files with 3499 additions and 180 deletions
@@ -0,0 +1,50 @@
+import sys
+import os
+
+# Add parent directory to path
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from contec_parser import parse_contec_binary_packet
+
+# Read captured stream
+filepath = "/home/prathiyuman/Prathiyuman/ContecMonitor/fiveparaminte-main/scratch/raw_contec_stream.bin"
+try:
+    with open(filepath, "rb") as f:
+        stream = f.read()
+except Exception as e:
+    print(f"Error: {e}")
+    sys.exit(1)
+
+print(f"Loaded raw stream of {len(stream)} bytes")
+
+# We will scan the stream and feed packets into the parser
+# Since we know the packets start with 0x46 at index + 3, let's scan.
+i = 0
+packet_count = 0
+parsed_count = 0
+last_vitals = None
+
+while i < len(stream) - 4:
+    b0, b1, b2, b3 = stream[i], stream[i+1], stream[i+2], stream[i+3]
+    if b3 == 0x46:
+        pkt_len = b0 | (b1 << 8)
+        if 30 < pkt_len < 1050 and i + pkt_len <= len(stream):
+            pkt_data = stream[i:i + pkt_len]
+            packet_count += 1
+            
+            # Feed packet to parser
+            vitals = parse_contec_binary_packet(pkt_data, "192.168.100.139")
+            if vitals:
+                parsed_count += 1
+                # Check if fields changed
+                v_dict = {k: v for k, v in vitals.model_dump().items() if v is not None and k not in ['device_id', 'patient_id', 'timestamp', 'ip_address', 'present_fields']}
+                if v_dict and v_dict != last_vitals:
+                    print(f"Index {i} (len={pkt_len}) -> Vitals: {v_dict}")
+                    last_vitals = v_dict
+            i += max(pkt_len, 4)
+        else:
+            i += 1
+    else:
+        i += 1
+
+print(f"\nDone. Scanned {packet_count} packets, successfully parsed {parsed_count} packets.")